SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7046e3e8b59458a54d558df1d2f2a3075ed23e399059a6c07f7c6a643802a6' 
  AND token = '91G9uVcXNTlH1J71zPgCsH6C8a3BvnDxtQoOjBhJXZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}